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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '197198a0f9e5c1c1eff10d398e0066aec4b3c34fd6b9fbd26041d89ebf11a9fd' 
  AND token = '8rxqVz58SvEn+7ZY0y3GvzbtsY44H05dCS/DyKIdyA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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