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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc1ee02830d39f3d3e4802e7e4dd76d9496900502bc1e6235153f71767eddb5' 
  AND token = 'bIfgW7Or1aa24YP/Dv+AGaTVwPqXHLg38DfvCFPNuI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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