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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64b05b972cc99f9994494486855f9131189f0c2293aba656f846376271973fe5' 
  AND token = 'rs7fFb6z/thcJZ+co9YJvz8Ew1PWhc6eGm2+Nc+15Ec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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