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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f156834a0394d0b0aec55f09019aa375b8eb5a87472523138b1914010265f746' 
  AND token = 'ycZd0dP9tjYqawuA6NV29NI8A7JtVS27GCNP7bS3foM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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