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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '191ce78b39bcb70fe0f0c7f182a60d128d9a1416317c785981b78ebb6b2ee753' 
  AND token = 'l7KSMz4JuZ3+OM+G67j1iYDax6bfCNBwTur8pm8Z7eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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