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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8ab9c3c8e92cc7be458519755ecd228374baf815f067daa0e3fd8146715b1e2' 
  AND token = 'FmaPqnARusOK61SQ5j6sr57oQVQ/iu+m8SCeu3/b5EM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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