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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2b896ba691bb85d0b06c7a78668b609b3a0273affb1d1124dbecff032b925a' 
  AND token = 'GTectw+5/5mw2ehbsJVXGC2PU+MPLP4f2djvliQN/m0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}